Terminal equipment ring/ding suppression circuit

Details Terminal equipment ring/ding suppression circuit Terminal equipment ring/ding suppression circuit

1983-07-21

1984-08-28

Rubinson, Gene Z.

179 81R, H04M 338

Patent

active

044685416

ABSTRACT:
A telephone subscriber's terminal equipment, which is part of a telecommunications network, is disclosed which includes ring suppress circuitry that prevents a ringing signal, which indicates the presence of an incoming call, from dinging the bell in the terminal equipment until the calling party is identified. The ring suppress circuitry also permits required loop current through the subscriber's terminal equipment to provide subscriber billing protection for the telephone company. The terminal equipment includes a microprocessor that detects the ringing signal and activates a relay in the ring suppress circuitry to prevent the terminal bell from dinging. Suppression of the ding is attributable to two back-to-back zener diodes connected in series with the relay contact and between the tip and ring conductors of the terminal equipment.

REFERENCES:
patent: 3936617 (1976-02-01), Bolgiano
patent: 4001708 (1977-01-01), Bolgiano
patent: 4006316 (1977-02-01), Bolgiano

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